In this sentence, the pronoun is his, which means that the antecedent has to be the word that his refers to. The antecedent in this sentence is <span>Samuel. :)
But the king intervened and the existing interim was indefinitely prolonged. after the issue of the Interim in May 1548. Then began a religious interim, which was gradually prolonged for ten years, during which time Protestantism in Poland flourished exceedingly.
Writers must research for facts and answer. They need to research to make sure every word the say is true. With their research they turn it into their own words mixed with their own ideas.